With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgVdMaxVdoms
fg Vd Max Vdoms
1.3.6.1.4.1.12356.101.3.1.2
The maximum number of virtual domains allowed on the device as allowed by hardware and/or licensing
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgVdMaxVdoms on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet firewalls right now.